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Tix Clock Gems

[October 2015] Originally created. Tix Clock Implemented In a Gem Mine Diorama.

<iframe width="560" height="315" src="https://www.youtube.com/embed/ujTU1ziXk1o" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

Description

This TIX clock implementation is a great first time project for beginners. Apart from visually pleasing, the clock is of practical use and keeps accurate time via it's 32Khz clock crystal. The construction is easy as there are only 4 breadboard wires involved.

At the same time it allows certain creativity in that 1) LEDs within the same group can be rellocated for different patterns, and 2) the length of individual LEDs can vary as to different a personalized LED gem "landscape". The TCG (Tix Clock Gems) demonstrates LED charliplexing in groups and usages of timers.

IMG

Tix Clock Tells Time is 8:42

Features

  • Minimal jumper wires, 4 on a mini breadboard
  • Personalization via LED placements and leg lengths
  • Battery operated from 3V
  • Use of 32Khz clock crystal to keep time, power-down sleep mode (LPM3) takes less than 1uA power

IMG

in sleep mode

Parts list

  • 170 tie point mini breadboard
  • MSP430G2412 (or other G/F series dip 20 pin devices w/ 4k flash)
  • Lots of LEDs (1 blue, 9 green, 6 yellow, 9 red)
  • Tactile button
  • 32Khz clock crystal
  • CR2032 button cell holder (battery not included)

Application Notes

  • Single button press shows time for a few seconds, TCG returns to sleep after that
  • Long press setup time, starting with the hours, related LEDs starts to blink
  • Short press advance the hour value. Another Long press confirms the entry
  • The tenths of the minutes and the minutes are subsequently entered like the hour
  • Once the hours and minutes (tenths and singles) have been entered, TCG returns to show mode

IMG

Breadboard Layout


   +=====================================================+
   |  .  o-----(W3)-----o  .  .  .  .  .  .1>.  .8>.  .  |
   |  . (-) .  .  .  .  .  .  .  .  .  .+>.  .4>.  .3>.  |
   |                \.  .  oXTo  .  .  .  .<5.  .<6.  .  | XT 32Khz Clock Crystal
   |                 :+-(W1)--------o  .<7.  .<2.  .<9.  | W1 +ve battery to IO (reset)
   | Battery Holder  :| ---+--+--+--+--+--+--+--+--+  o  | W2 b2 to led extension column
   |                 :||- b6 b7 CK IO a7 a6 b5 b4 b3| |  | W3, W4 battery power to MCU
   |                 :||+ a0 a1 a2 a3 a4 a5 b0 b1 b2|(W2)|
   |                 :| ---+--+--+--+--+--+--+--+--+  |  |
   |                 :| .  .  .1>.  .9>.  .1>.  .2>.  |  | > side of led is anode (longer leg)
   |                /.| .  .2>.  .3>.  .4>.  .3>.  o--+  |
   |  . (+) .  .  .  .| .  .  .<6.  .<5.  .<6.  .<5.  .  |
   |  .  o-----(W4)---+-o-[B]-o  .<4.  .<7.  .<8.  .  .  |
   +=====================================================+

Schematic

                            MSP430G2xxx
                         -----------------
                        |                 |                   /|\
                     <--|TEST        RESET|--------------------+
                        |                 |                    |
               ~~~~~~~~ |P2.0         P1.0|--> ~~~~~~~    _|_  |
              {         |P2.1         P1.1|-->        }--o   o-+ button
              { Magic   |P2.2         P1.2|-->        }
              {  LOL    |P2.3         P1.3|-->  Many  }
              {         |P2.4         P1.4|-->  LEDs  }
               ~~~~~~~~ |P2.5         P1.5|-->        }
      32Khz /-----------|P2.6(XIN)    P1.6|-->        }
    Crystal \-----------|P2.7(XOUT)   P1.7|--> ~~~~~~~
                        |                 |

Assembling

Follow breadboard layout and place jumper wire on mini breadboard Place MSP430G2412 on breadboard Place Tactile Button Cut your LEDs into different lengths, *be sure to maintain one leg longer Place LEDs in groups of (1..9), opposing pairs on the same pin can be swapped for effect. Ex at b0-b1 #3 and #8 can be swapped. The "+>" is the blue LED indicating 10+ hours Place Battery Holder

Source code

Source code usually resides in my github repositories. For this particular project, the single C source file tix.c is bundled in my breadboard collections repository. You just need tix.c